Telescope from Circumferentor, by Benjamin Cole, London, c. 1750

Telescope with bubble level, direct reading scale and an index arm which can be locked for levelling. The telescope can be attached on top of the compass so that the direction of the telescope could be more accurately plotted. Both ends of the telescope are lidded. Both feet of the telescope have screws in their base for attaching the telescope to the edge of the mounted compass. The scale is calibrated in Links of Chain.